Evaluating the Flame Retardancy of Shaving Super Bamboo Layer by Layer Self-Assembly With Phytic Acid-Polyethyleneimine

Peng Lin,Xiaochun Zhang,Junfeng Hou,Yingqiu Jiang,Wenbo Che,Lingfei Ma,Xiaolin Ru,Youming Yu

doi:10.3389/fmats.2021.697732

Peng Lin, Xiaochun Zhang + Show 6 more

Open Access

https://doi.org/10.3389/fmats.2021.697732

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Abstract

To improve the flame retardancy of bamboo materials, layer by layer (LbL) self-assembly of phytic acid (PA)-polyethyleneimine (PEI) on the surface of shaving super bamboo specimens with different solution concentrations of PA-PEI and times of LbL self-assembly was completed in this study. Fourier transform infrared analysis results showed that PEI was well assembled to the surface of bamboo specimens by a hydrogen bond with PA as intermediation. The application of PA and PEI significantly promoted the formation of carbon residue, as characterized by simultaneous thermal measurements. Particularly, the peak heat release rate and total heat release rate of bamboo self-assembly with 10 wt% PA and 10 wt% of PEI solution were reduced by 19.36 and 22.3%, respectively. The treated bamboo specimen showed increases of 35.56 and 480.70% in fire performance index and residual mass, respectively, compared to the control sample. Besides, yields of CO and CO2 were decreased by 17.77 and 17.07% in comparison with the control group, respectively. The LbL self-assembly with PA-PEI can effectively improve the flame retardancy of bamboo materials by promoting the formation of a residual char layer.

Highlights

Bamboo presents high application prospects and economic value as a substitute for wood due to its similarity to wood in compositions and structures (Scurlock et al, 2000; Zhang X. et al, 2019; Zhang L. et al, 2020)
It was concluded that adsorption capacities of phytic acid (PA) and PEI were increased with the treatment by layer by layer (LbL) self-assembly method and the increase of solution concentration
The formation of a protective char layer during the cone calorimeter measurement acts as a barrier, reduces the HRR and the yield of CO2, and further increases residual mass, indicating that a well-integrated flame retardant performance was obtained to the bamboo specimens treated with the intumescent flame retardant (IFR) solution of 10 wt% PA and 10 wt% PEI five times the LbL self-assembly with PA-PEI

Summary

INTRODUCTION

Bamboo presents high application prospects and economic value as a substitute for wood due to its similarity to wood in compositions and structures (Scurlock et al, 2000; Zhang X. et al, 2019; Zhang L. et al, 2020). PA is selected to provide an acid source and phosphorus source to improve the flame retardant performance, and polyethyleneimine (PEI) provides a gas source for its high nitrogen content and positive charge in solutions (Liu et al, 2016; Ran et al, 2019; Huo et al, 2021). An LbL self-assembly method was applied to assemble and install PA to be negatively charged and PEI to be positively charged on the surface of shaving super bamboo to fabricate bamboo materials with excellent flame retardant performance (Laachachi et al, 2011; Laufer et al, 2012; Wang et al, 2017; Fang et al, 2019). The technology of LbL self-assembly with PA-PEI solution was first applied to improve the flame retardancy performance of shaving super bamboo. All the experimental treatments were performed three times with the average values reported

RESULTS AND DISCUSSION

CONCLUSIONS

DATA AVAILABILITY STATEMENT